Think of all the heavily advertised eyepieces on the market. NONE have all 3 of the important features required to be considered the best. High Contrast and Resolution, Eye Relief and Wide Field of View.

All of the "Big Name" eyepieces have one or two features but never all 3. Except PENTAX. You can get the famous brands or the best.

The series has expanded from seven focal lengths to eight from 3.5 mm to 40 mm. The XW series features a wide apparent angle of view (70 degrees), JIS Class 4 weatherproof construction and a long eye relief (20 mm). We have tested them and the eye lenses are very wide and have a huge "sweetspot", unlike some wide field eyepieces. The new design uses ED Lanthanum glass and the world's best PENTAX-SMC multilayer coatings.

PENTAX offers the XW 30 and XW 40 eyepieces for planetary observations. Each eyepiece is compatible with the PENTAX PF-80ED, PF-80EDA and PF-100ED spotting scopes as well as a wide range of telescopes. Engineered using advanced computer simulation design technology, both eyepieces feature a 70-degree field of view, long eye relief, and the superior, high-performance glass elements and optics PENTAX is known for. Unsurpassed in their optical performance and quality, these eyepieces provide the ultimate in image sharpness and contrast.

The PENTAX XF12 is ideal for outdoor viewing and bird watching. This high-performance unifocal eyepiece offers a focal length of 12mm, provides bright, high-contrast images, and features an extendible eyepiece ring with four click-stop positions. ...

With a focal length of 8.5mm, the high-performance PENTAX XF 8.5 eyepiece is ideal for outdoor viewing and bird watching. As a standard unifocal eyepiece it offers a 60 degree apparent field of view, long eye relief, and bright, high-contrast...

The PENTAX XF Zoom eyepiece provides magnification of 20 to 60 times with the PENTAX 65mm spotting scopes, an apparent field of view of 42 to 60 degrees, and an eye relief of 11mm to 15mm. It also features a rubber eyepiece ring designed for...

Like each eyepiece in its series, the XW 10 eyepiece is designed specifically to provide ideal ground and astronomical observations with a telescope. It features fully multi-coated lenses to increase light transmission and color quality,...

The XW 14 eyepiece is designed for use with a wide range of PENTAX spotting scopes and telescopes. Featuring fully multi-coated lenses to increase light transmission and color quality, high-refraction lanthanum glass elements for high-resolution...

The XW 20 eyepiece is designed for use with a wide range of PENTAX spotting scopes and telescopes. Ideal for both ground and astronomical observations, this eyepiece features fully multi-coated lenses to increase light transmission and color...

With unsurpassed optical clarity and the shortest focal length in the XW series, the XW 3.5 offers a 70 degree field of view for easier viewing. All of our eyepieces are constructed with a high-refraction, low-dispersion lanthanum glass that...

With unsurpassed optical clarity and a short focal length, the XW 5.0 offers a 70 degree field of view for easier viewing. All of our eyepieces are constructed with a high-refraction, low-dispersion lanthanum glass that consistently delivers bright,...

With unsurpassed optical clarity and a short focal length, the XW 7.0 offers a 70 degree field of view for easier viewing. All of our eyepieces are constructed with a high-refraction, low-dispersion lanthanum glass that consistently delivers bright,...

The smc Zoom eyepiece features a magnification range of 20-60X, an apparent field of view of 38 to 60 degrees, and an eye relief of 20mm. Like all PENTAX eyepieces, it is renowned for its outstanding image reproduction. With its JIS Class 6 rated...